RECENT OPHIURANS. 227 



papillae; the inner (proximal) one is racquet-shaped, i. e. wide and oval at base 

 but suddenly contracted into a slender blunt spine, its whole length being 

 approximately equal to that of the oral plate; the outer, or distal papilla is a 

 mere, rounded scale, about equal to the basal part of its racquet-shaped fellow. 

 First under arm-plate squarish, very small; succeeding plates more or less 

 pentagonal, with a proximal angle, broader distally than proximally, about as 

 wide as long, barely in contact with each other; each plate has an indistinct 

 light spot on its proximal angle. Side arm-plates moderate; each carries a 

 series of four (or more conmionly three) slender, acute arm-spines, subequal or 

 next to the uppermost smallest, the longest rather exceeding the arm-joint. 

 Tentacle-scales two, the inner one very narrow and attached the whole of its 

 length to the lateral margin of the under arm-plate. Color (di'ied from alcohol), 

 very pale brownish. 



HoLOTYPE (M. C. Z. 1365) and 1 paratype (M. C. Z. 3924). Japan: 

 MOTJTH OF Bay of Yeddo. E. S. Morse collection. 



These specimens are accompanied by a sketch of the mouth parts and a 

 label "Amphiura sp. nov.? B" in Mr. Lyman's hand. The species is very near 

 A. concolor from near the Aru Islands but is readily distinguished by the char- 

 acteristic oral papillae, and by the much finer disk-scaling. It is one of those 

 forms which connect Amphiura and Amphiodia, having three oral papillae on 

 each side of the jaw and yet obviously an Amphiura in a restricted sense. 



479. A. LEPTOTATA, sp. nov. (XtTrriraroi, most fine). Plate 5, £. 1, 2. 



Disk 3.5 mm. in diameter; arms 30-35 mm. long, very slender. Very near 

 A. borealis of the Norwegian coast, having the disk covered with a very fine 

 coat of scales (hence the name), narrow and almost parallel radial shields, three 

 or four small arm-spines and no tentacle-scales. The interbrachial spaces below 

 are nearly naked except near the margin. The only distinguishing feature 

 of importance which a direct comparison with specimens of borealis shows is 

 in the shape of the middle (or next to the lowest of four) arm-spine; in leptotata 

 this spine is very noticeably flattened and truncate, except at the very base and 

 on the distal part of the arm; near the middle of the arm it is most conspicuous. 

 Color (dried from alcohol) , pale gray. 



HoLOTYPE (M. C. Z. 1367). Philippine Islands. Semper collection. 



The close resemblance of this species to such a coldwater form as borealis 

 is very remarkable. It is also near to dilatata from the Cape of Good Hope, 

 but it is more readily distinguished from that species than from borealis. 



